US2003698A

US2003698A - Method of and apparatus for separating sheets from stacks thereof

Info

Publication number: US2003698A
Application number: US594194A
Authority: US
Inventors: Joseph P Remington
Original assignee: Stokes and Smith Co
Current assignee: Stokes and Smith Co
Priority date: 1932-02-20
Filing date: 1932-02-20
Publication date: 1935-06-04
Anticipated expiration: 1952-06-04

Description

June 1935- J. P. REMINGTON METHOD OF AND APPARATUS FOR SEPARATINQ SHEETS mm sTAcKs THEREOF Filed Feb. 20} 1952 2 Sheets-Sheet l INVENTOR.

146; la. filgf ATTORNEY.

Nb w Mn June 4, 1935. p REMlNGTCN 2,003,698

METHOD OF AND APPARATUS FOR SEPARATING SHEETS FROM STACKS THEREOF Filed Feb. 20, 1932 2 Sheets-Sheet 2 INVENTOR.

la. I W

Patented June 4, 1935 UNITED STATES METHOD OF AND APPARATUS FOR SEPA- BATING SHEETS FROM STAOKS THEREOF Joseph P. Remington, Philadelphia, Pa., assignor to Stokes and Smith Company, Philadelphia, Pa., a corporation of Pennsylvania Application February 20, 1932, Serial No. 594,194

24' Claims.

My invention relates to a method of and apparatus for separating sheets, one at a time, from a pile or stack thereof, particularly when the sheets are of material which is limp, or having little or no rigidity or elasticity, as in the case of cloth, paper and the like, having such characteristics that neighboring sheets thereof adhere to each other or exhibit considerable resistance, due to friction or the like, to movement of a sheet away from or flatwise along the surface of its immediate neighbor in the stack.

Inaccordance with my invention the separation of sheets of material of the character aforesaid, one at a time from a stack, is effected by reducing or eliminating in one or more areas or regions simultaneously or in succession, by equal or unequal movements of the top sheet with respect to the neighboring sheet, the adhesion or cohesion of the top sheet to or with the immediately adjacent sheet in the stack, or by reducing the friction between the top sheet and its immediate'neighbor in the stack, and simultaneously, or preferably thereafter, taking hold of the top sheet and by movement in any suitable direction or directions with respect to the stackremoving the top sheet without substantial disturbance of its neighbor.

Further in accordance with my invention the stack of sheets, of material of the character aforesaid, is elevated as sheets are removed in succession from the top thereof, with maintenance of a substantially constant top level of the stack.

It has been found in practice that sheets, of material of the character above mentioned, cannot be satisfactorily separated and fed from a stack (as may sheets of paper or other material which, though flexible or pliable, are smooth or more or less rigid or elastic) because sheets of limp or cloth-like material act quite differently due to their physical properties, causing adhesion, cohesion or friction between neighboring sheets. For example, a sheet of cloth, such as a towel, napkin or other flatwork of cloth, does not readily slide one upon its neighbor; the

sheets, because of their limpness and surface' structure adhere or cling to each other at their contacting surfaces which mutually interlock or so frictionally engage that in attempting to remove one sheet from or drag it along the surface of its neighbor causes the latter and even other sheets adjacent thereto to roll back upon itself or themselves'or so' otherwise behave as to render it difficult to insure that always one,

but never more than one, piece or sheet at a time is picked up or removed from the stack.

In accordance with my invention, however, as

, above indicated, by suitably reducing or eliminating the interfacial adhesion or friction between 5 the top sheet and its immediate neighbor in the stack, the top pieces or sheets may be removed one at a time in succession, and in rapid sequence if desired, without disturbance of the adjacent sheet or sheets; the step of so reducing or eliminating the interfacial adhesion or friction preferably wholly precedes the step of lifting or dragging the top sheet from the stack, though the first of said steps may be initiated before and continue during a suitable portion of or through- 15 out the second step to the time of substantially final separation of the top sheet from its immediate neighbor in the stack.

Stacked sheets or pieces of cloth or other limp material of the character above referred to, may be described as to their adhesion or friction at their engaging faces as felting together; and the adhesion or friction between adjacent sheets is the more pronounced if the sheets for a considerable time have been in contact with each 25 other in the stack. The adhesion or friction between sheets makes it diflicult to draw the top sheet across the top surface of the remainder of the pack or stack without sometimes also drawing with it the second sheet or rolling back the 30 edges of one or more sheets; this difiiculty is encountered especially in attempting suddenly or quickly to remove or lift the top sheet. from the stack.

Whether a single sheet or two sheets is or are 35 at one time removed from the stack depends upon the extent of friction or adhesion between the top and the second sheet as compared with the friction or adhesion between the second and third sheets of the stack, as may be shown by placing a piece of smooth or glazed paper between the second and third sheets, in which case, on attempting to remove the first sheet alone from the stack very frequently the second sheet will come with it, or at least be rumpled or disturbed in its position which is just as undesirable; while the third sheet will not be picked up because the intervening paper reduces or eliminates adhesion or friction between the second and third sheets.

In accordance with one aspect of my invention the friction or adhesion between the top sheet and its immediate neighbor in the stack is sufficiently overcome, reduced or eliminated by picking up and/or moving the top sheet, a little at '55 a time, and if desired simultaneously or successively and to equal or unequal extents at a plurality of places or regions within the borders of the sheet, off from, over or along the surface of the second or neighboring sheet, without disturbing the adhesion or friction between the second and third sheets, which during the removal of the top sheet assists by preventing disturbance, deformation or rumpling of the second sheet. In consequence, when the top sheet is picked up and transported, the second sheet remains undisturbed or maintains its flat formation, because there still exists maximum or sufiicient adhesion or friction between the second and third sheets to hold the second sheet smoothly in place.

It accordingly will be. appreciated that my invention is distinguished from the use of mechanical means such as blades, or pneumatic means, such as compressed air, applied between the sheets to separate the top from the adjacent sheet because, instead of interposing separating means or medium between the top and second sheets, only the upper or exposed surface of the top sheet is operated upon.

A stack or pile of sheets of cloth or other generally like limp material yields or is to some extent elastic or compressible in the direction of depth of the pile or stack. In consequence, height indicators or feelers, which selectively opcrate or fail to operate in control of elevation of the stack, as commonly used in paper feeding, are inadequate, because even small variation in pressure of the indicator or feeler on a stack of sheets of cloth or other limp material indents the indicator or feeler into the top surface of the stack to a distance greater or less than the thickness of one sheet, and so causes undesirable or irregular stack elevation. 'In accordance with my invention, however, a counterbalanced feeler or height indicator of invariable or constant weight is employed, and so disposed or designed that the force required to operate the more or less robust or heavy mechanism for elevating the stack does not react upon or affect the indicator or feeler to vary its pressure on the top of the stack from a substantially constant magnitude.

My method or apparatus is utilizable alone, or in association with or as a part of methods or systems, including those disclosed in' my copending applications Serial No. 510,084, filed January 21, 1931, Serial No. 583,439, filed December 28, 1931, and Serial No. 596,774, filed March 4, 1932.

For an understanding of my method, and for an illustration of some of the various forms my apparatus may take, reference is had to the accompanying drawings, in whichf Fig. 1 is a fragmentary side elevational view, parts in section of a stack of sheets of limp material on the elevator feed table, showing the top sheet partially separated from its neighbor;

Fig. 1a illustrates a modification of the adhesion-reducing device;

Fig. 11) illustrates a further modified form of adhesion-reducing device;

Fig. 10 illustrates a further modification of the adhesion-reducing device;

Fig. 1d illustrates a later stage of operation of the structure shown in Fig. 10;

Fig. 2 is a view similar to Fig. 1 illustrating a later stage of the operation;

Fig. 3 is a perspective view of a system for removing sheets one at a... time from a stack, in association with stack elevating means and control therefor; I

Fig. 4 is a fragmentary side elevational view illustrating a modified method and structure for reducing or eliminating the adhesion or friction between the top sheet and its immediate neighbor in the stack;

Figs. 5a, 5b and 5c are illustrative of successive stages in the operation shown by Fig. 4;

Figs. 6 and 7 are fragmentary side elevational views illustrating successive stages of operation in removing a top sheet from a stack;

Fig. 8 is a fragmentary side elevational view illustrating a modification in the mode of removal of a top sheet from a stack.

For brevity hereinafter, the stacked sheets willbe referred to as towels, a generic term including towels, napkins, fiat piece laundry work, and other sheets of cloth, felt paper or other limp material having the characteristics hereinbefore referred to.

Referring to Fig. 1, the towels T are shown disposed in a stack or pile upon the support or table I which, as hereinafter described more particularly in connection with Fig. 3, is elevated as the height of the stack diminishes.

To break up or reduce the adhesion between the top towel Ti and its immediate neighbor T2 is provided any suitable number of

devices

2, 2, rotating continuously or intermittently, or equivalent devices, which may be termed "peelers", suitably disposed in one or more places or regions within the borders of the towel Tl, generally producing therein ripples or waves, such as W, W. The devices 2, 2' may be of any suitable character for the purpose, and in the example illustrated comprise sheet or

leaf springs

3, 3 secured at their inner ends tangentially to collars secured upon the shafts 4, .4, rotating in the directions indicated by the arrows. The backs or towel engaging surfaces of the members 3, 3' are suitably roughened, as by application thereto of emery cloth, carding cloth, or equivalent means, whereby the members 3, 3' in their rotation brush or whip the exposed surface of the towel Tl drawing opposite ends thereof longitudinally along the upper surface of the second towel T2, thereby generally forming the aforesaid self-sustaining waves or ripples W, W, more or less pronounced, and so or in any event breaking up or diminishing the adhesion or friction between. the towels TI and T2.

Located in any suitable position, and in the ex ample illustrated in Figs. 1 and 2 between the devices 2, 2', are the

eccentrics

5, 5, rotating continuously or intermittently, or equivalent mechanism such as cranks or cams, secured upon and rotated by the shafts 6, 6', rotating in the directions of the arrows, imparting to the eccentric strap members 1, I, movements having components parallel with and toward and away from the towel Tl, the strap members 1, I having for the purpose slots 1a and la by which the strap by the shafts or rods 8, 8' extending through the slots. The other ends of the strap members 1, I

carry

carding cloth

9, 9, or any equivalent means or material, adapted to engage the surface of and move the towel Ti. The carding cloths 9, 9' are shown in Fig. 1 as having been brought into enmembers are hung upon and guided or confined I gagement with the top towel, and in their conmembers ID for thereafter removing, dragging or lifting the towel TI form the stack and transporting it to any suitable destination as for example to feed rolls of mechanism for further folding the towel Tl into smaller compass. The gripping members l close and open, and carry the towel away from the stack, in timed relation tc\ the adhesion-breaking devices.

The

devices

3, 3, or equivalents, and the devices 9, 9', or equivalents, operate in timed relation to each other whether they move continuously or intermittently.

Assuming the

rolls

4, 4 and 6, 6 rotate at the same speeds or angular velocities, as in the case illustrated by Fig. 3, and because the

members

3, 3! are suitably angularly displaced upon their shafts from the corresponding positions of the eccentrics 5, upon their shafts 6, 6', the members 3, 3' first engage the towel TI and break or reduce the adhesion or friction between it and the towel T2 before the members 9, 9' engage towel Tl, taking up the slack as represented by the ripples or waves W, W, and fold or crease the towel at- F, raising it at that region at the same time to position sufficiently removedfrom the second towel T2 to prevent the towel-holding or gripping and transporting structure I 0 from picking up the second towel T2.

While the first step, that performed by the

members

3, 3, is preferably completed or substantially completed before initiation of the second step of the operation performed by the

members

9, 9, it will be understood that by otherwise relatively disposing the

members

3, 3 angularly withrespect to the eccentrics 5, 5', the first step, at least begun before initiation of the second step, may to suitable extent either partially or wholly overlap or coincide with the second step. In general, however, it is preferred that the first step be completed or substantially completed before initiation of the second step of the two-step operation of breaking or reducing the adhesion or friction between towels TI and T2 and folding or creasing the towel Tl as at E, Fig. 2; and it is preferred that the first step be completed or substantially completed by the time the mechanism I0 starts to strip or remove towel T| from the stack.

While by their relations indicated in Fig. l, the

members

3 and 3 perform their adhesionbreaking operations substantially simultaneously, they may perform their functions dis-simultane-' ously, so long as over a sufllcient portion of the towel Tl its adhesion to its neighbor T2 is sufficiently broken or reduced to permit the second step operations of folding, taking hold of and removing the towel Tl.

Breaking a part of the total adhesion or friction between the towels TI and T2, besides that effected by the members 3, 3', is effected by the members 9, 9' as part of the second stage or step above described; the members 3, 3' break up or reduce the adhesion sufficiently to allow the re-. mainder to be broken up or reduced by the memfirs 9, 9', making it safe to continue breaking 'e adhesion or friction on enough of the remainder of the towel Tl without danger of picking up the second towel T2.

Referring to Fig. 3, the stack elevating table I is raised short distances from'time to time, or step-bystep, by the lugs or table-supporting elements secured to the belts or chains I2 passing over the pulleys or sprockets l3, secured upon and rotated by the shafts l4, driven in unison by gearing not shown, and passing over the idler pulleys or sprockets Ila.

Secured upon shaft I4 is the worm wheel I! meshing with and driven from time to time'by the worm l6 secured upon shaft l1. While the worm It may drive the wheel i5, the latter, under the influence of the weight of the table and the stack T is not able to rotate the worm l6 and so influence the elevator control or reverse the elevator movement. Mounted loosely upon the shaft is a bell crank l3 carrying on its one arm a roller or follower l9 held in engagement with the eccentric 20, secured upon the drive shaft 2|, by a spring I811. With a ratchet wheel 22, with its one face adjacent an arm of the bell crank 8, secured upon the shaft II for rotating the latter from time to'time, coacts a pawl 23 pivoted upon the plate member 24, loosely mounted on shaft l1, and disposedadjacent the ratchet wheel 22; a spring 32 attached to plate 24 and to post 33 biases the plate 24 toward the right. A pin 25 carried by the plate 24 coacts with the other arm of the bell crank lever l8. A latch or detent 26 is secured upon the shaft 2! in position to engage the edge of plate 24 or in a notch or depression 28 therein. An ,arm or crank 29 secured upon the shaft 21 carries a pin 30 adapted in its lower position to engage one end of the lever arm 3| loosely Journalled upon the shaft 21, and provided with the laterally extending indicator or feeler element 3|a resting. upon the top of the stack T. The arm 3| and member 3|a have such excess weight on that side of axis of shaft 21 at which member 3|a is disposed, as to force the pin 30 upwardly,

upon descent of feeler member 3|a upon withdrawal of a. towel or towels from the stack, thereby lifting the latch 26 from the notch 28, permitting spring 32 to rotate plate 24 toward the right when the upper member of the bell crank level I3 has been moved toward the right upon descent of the cam 22, therebycausing the pawl 23 to engage the ratchet wheel 22 in a new position, whereby, upon the next ascent of the cam 20, the upper arm of the bell crank l8 will rotate toward the left, rotating shaft II, worm I6, gear l5, shafts l4 and pulleys or sprocket wheels l3 to cause upward movement of the. lugs or abutment ll, thereby elevating the top of the stack.

If the increment 'of elevation so effected is sufficient to restore the top of the stack to the proper level with relation to the adhesion breaking and towel removing devices, the parts resume their position indicated in Fig. 3 until upon further removal of one or more towels feeler member 3 la' again descends sufliciently to initiate a further increment of elevation of the stack. Ordinarily a single incremental movement of the shaft IT, as above described, will sufllce to restore the top of the stack to desired level; if for any reason such movement should not be sufficient, one or more further incremental movements will be imparted by the next rotation or rotations of the cam or eccentric 20.

The plate 24 and detent 26 serve to lock the stack elevating mechanism when the pressure between the feeler 3|a and the stack overcomes the weight of and lifts the feeler system, comcordingly the feeler member Ila will not be indented or pressed into the top of the stack. It is characteristic of the control that no pressure except that of the weight of the arm 30 and member 3Ia is or can be exerted upon the stack. Inconsequence the height indicator or feeler 3Ia moves through only the range corresponding with the thickness of one or more towels removed, affording nice or substantially exact control of stack elevation, which would not be the case if the elevating mechanism reacted to press feeler 3Ia into the yielding or elastic stock.

The shaft 2| is rotated at substantially constant speed by its driving pulley or gear 34. Beside driving the aforesaid cam or eccentric 20 for stack elevation, the shaft 2| rotates the spiral gears 35 meshing with and driving the spiral gears 36 secured upon the shafts l, 6, 6' and 4 to rotate them for the purposes and with the results above described.

The stack elevating mechanism and its control above described have in practice been found satisfactory and reliable, even when the towels or sheets constituting the stack as a whole are of different thicknesses due to varying degrees of shrinkage corresponding with their prior histories.

While reference has been made more particularly to elevation of sticks of towels or sheets of cloth of such nature that the stack is more or less yielding in the direction of its depth, it will be understood that my system of stack elevation and control therefor are generally applicable to all cases where the stack is so substantially cornpressible, including the case where the sheets are of paper, particularly embossed paper.

It will be understood that various modifications in the above described method and apparatus, are comprehended within my invention; for example, some of the further modifications are illustrated by Figs. 4 to 8 inclusive.

In Fig. 4 a series of any suitable number of members 3 or equivalent are provided for breaking the adhesion or friction between the top towel TI and its immediate neighbor T2. These members 3 are angularly displaced with respect to each other, whereby they operate at different regions in succession upon the towel TI. Furthermore, as indicated, the members 3 may be of different lengths, and in the example illustrated decrease in length from left toward the right whereby the left hand member 3 eifects greater movement of the towel TI with respect to towel T2, the middle member 3 produces a second and lesser movement, and the right hand member 3 produces the least and last movement.

Figs. 5a, 5b and 50 show the several members 3 of Fig. 4 in three successivepositions subsequent to their relative positions indicated in Fig. 4. The action issuch for example that the left hand member 3 in Fig. 4 has begun to form a wave or ripple W which is at its maximum in Fig. 5a. Thereafter, as indicated in Fig. 5b, the middle member 3 has produced the second wave or ripple WI, without wholly flattening the first ripple or wave W. In Fig. 5c thethird and shortest member 3 has reduced the ripple or wave WI and produced the third ripple W2. The result is that a plurality of ripples are effected in succession, the first being reduced by the formation of the second, and the second reduced by the formation of the third. There results, therefore,

regions or areas in succession. The towel TI may then be dragged, lifted or otherwise removed from its neighbor T2 and the stack as a whole with assurance that only the top towel TI will be removed from the stack and without disturbance of its neighbor T2 which still adheres to the next towel beneath.

As indicated in Figs. 6, 7 and 8 the mechanism, comprising the carding cloth or equivalent member 9, is positioned to the right of the several members 3 and operates adjacent one edge of the towel TI. In Fig. 6 the member 9 is in engagement with the towel TI beginning to lift it to position indicated in Fig. '7 for moving it toward the right for delivery to the feed rolls 31, 38, of any suitable mechanism for further operating upon the towel, as for example for further folding it into smaller compass.

In Fig. 6, the ripples or waves W, WI, W2 have been produced as described in Figs. 4 to 50 inelusive, with resultant breaking or reduction of the adhesion or friction between towel TI and its neighbor T2 up to a region generally indicated by X, assuring that the member 9 or equivalent may then operate to remove the towel TI and deliver it to some other position.

As indicated in Fig. 8, in'lieu of the carding cloth 9 or equivalent there may be used a mechanism III of the character above described for grasping the crease or fold F and so removing the towel TI from the stack by movement in any suitable direction or directions, the friction or adhesion having been broken up as in the immediately preceding figures up to the region X.

While throughout the various figures of the drawings the adhesion-reducing devices have been illustrated as comprising single spring members 3 in or for each area or zone, it shall be understood that as illustrated in Fig. la any suitable number of blades or springs 3 may be employed. By a structure of this character successive adhesion-breaking forces are applied in each region 01' zone of the top sheet. In this example, each of the several members 3 imparts a wiping or a sliding movement of the top sheet upon its neighbor. In order that none of the elements 3 shall engage the second sheet T2, their shaft 4 is located such distance from the end of the stack that the total movement of the top sheet Ti imparted by the several members 3 will not uncover the second sheet T2 sufflciently to expose it to the action of a member 3.

Referring to Fig. 1b, there is illustrated a type of adhesion-reducing device generally corresponding with a like device utilized, as illustrated in Fig. 1, for both reducing adhesion and lifting the topmost sheet TI clear of its neighbor. Here again the structure comprises an eccentric 5 secured upon and rotated by its shaft 6 to impart to the strap 1, having as before theslot 'Ia receiving the shaft 8, a movement having components parallel to the top of the stack and away from the stack thereby causing the carding cloth 9 or equivalent to engage the exposed surface of the top towel TI and move it flatwise along the surface of the towel T2 producing a ripple or wave W, thereafter separating the uppermost towel and moving it away from the stack, and returningto repeat the same cycle of operations upon the next sheet.

It shall be understood that the devices illustrated in Fig. lb may be used in lieu of those of the character illustrated in the other figures, including Fig. 1a, utilizing roughened springs 3 or the like.

Referring to Figs. 1c and 1d, there is shown a further modification, for reducing adhesion between the top towel and its neighbor, which may be utilized in lieu of any of the devices for like purposes shown in any of the other figures hereof. In this case carding cloth or equivalent 9a is carried upon an eccentric rod lb terminating at the left in the eccentric strap 1 within which is the eccentric 5 secured upon and rotated by its shaft 6. At a suitable position upon the rod 1b is disposed a roller or cam follower adapted to ride upon the cam surface 1d constituting an edge of the member 1e.

The carding cloth 9a first moves from left toward the right, substantially parallel to the top of the stack so long as the follower 1c is upon the left hand horizontal portion of the cam surface ld, thereby sliding the top towel Tl upon its neighbor T2 sufliclently to set the wires or teeth of the carding cloth 9a into the towel Tl. In continuing the stroke as effected by the eccentric 5, the follower rides up upon the inclined portion of the cam surface 1b thereby imparting to the cloth 9a a movement having components both parallel to and away from the stack; later the follower lc rides upon the right hand horizontal portion of the cam surface id to its final position, indicated in Id, bywhich time there has been formed in the top towel a ripple or wave W which persists after further movement of So on its return stroke from engagement with the sheet Tl.

While hereinbefore for purposes of description towels, napkins or other sheets of limp cloth have been more particularly referred to, it will be understood that my method and apparatus are utilizable also for removing one at a time from a stack sheets of other limp materials, exhibiting interfacial cohesion, adhesion or friction of the character hereinbefore referred to, as may be the case with some classes of paper, skins, felt, leather, rugs, carpets and the like.

For brevity in the appended claims, the term limp is employed generically to include the characteristics of cloth, paper and other mate'- rials which are limp, filmsyor the like causing adhesion, cohesion or friction of the character hereinbefore described; and the term adhesion is employed generically to include adhesion, cohesion, friction or such other interfacial action which, unless reduced or broken, would prevent separation of a single sheet at a time from a stack without disturbing the adjacent sheet or sheets.

What I claim is:

1. A method of separating one sheet at a time from a stack of limp sheets, which comprises reducing the adhesion between the top sheet and its neighboring sheet beginning adjacent an end of the top sheet and progressing in zones toward the other end of said top sheet, and adjacent said other end picking up and removing the top sheet from the stack, without substantial disturbance of said neighboring sheet.

2. A method of reducing the adhesion between a top sheet and its neighboring sheet in a stack of limp sheets, which comprises producing a ripple in the top sheet, and in a. different area reducing said ripple by producing a further ripple in said top sheet.

3. A method of reducing the adhesion between a top sheet and its neighboring sheet in a stack of limp sheets, which comprises moving the top sheet to an extent to produce a ripple therein, and in another region producing movement of the top sheet of lesser extent to reduce said ripple and produce another ripple therein.

4. Means for separating one sheet at a time from a stack of limp sheets comprising means for reducing the adhesion between the top sheet 5 and its neighboring sheet successively in different areas of the top sheet, and means for removing the top sheet from the stack.

5. Means for separating one sheet at a time from a stack of limp sheets comprising means 10 for imparting movements of different extents in different areas of the top sheet to reduce the adhesion between the top sheet and its neighboring sheet, and means for removing the top sheet from the stack.

, 6. Means for separating one sheet at a time from a stack of limp sheets comprising means for imparting movments of different extents in, succession in different areas of said top sheet to reduce the adhesion between the-top sheet and its neighboring sheet, and means for removing the topsheet from the stack. I

7. Means for separating one sheet at a' time from a stack of limpv sheets comprising means reducing the adhesion between the top sheet and its neighboring sheet in separated zones, and means between said zones for removing the tops sheet from the stack. J

8. Means for separating one sheet at a time from astack of limp sheets comprising means reducing the adhesion between the top sheet and its neighboring sheet in separated zones, means for producing a fold in the top sheet between said zones, and means for engaging said fold to remove the top sheet from the stack.

9. Means for separating one sheet at a time from a stack of .limp sheets comprising means in each of different zones extending between one end of said top sheet and its opposite end for reducing the adhesion between said top sheet and its neighboring sheet, and means adjacent one end of said top sheet for removing it from said stack.

10. Apparatus for reducing adhesion between limp sheets of a stack comprising means for pro-- ducing a ripple in the top sheet, means in an adjacent zone for reducing said ripple and producing a further ripple in the top sheet.

11. A method of separating one sheet at a time from a. stack of cloth sheets which comprises drawing the end sheet toward the center of the stack without exertion of appreciable pressure thereon to reduce the adhesion between it and the neighboring sheet, and thereafter removing the sheet from the stack.

12. A method of separating one sheet at a time from a stack of cloth sheets which comprises penetrating a portion of the end sheet and drawing it thereby toward the center of the stack to reduce the adhesion between it and the neigh- 0 boring sheet, and thereafter removing the sheet from the stack.

13. Means for separating one sheet at a time from a stack of cloth sheets comprising structure for penetrating the upper face of the top sheet of the stack, means for moving said structure toward the center of the stack to draw said top sheet along the sheet below and reduce the adhesion therebetween, and means for thereafter removing the sheet from the stack.

14. Means for separating one sheet at a time from a stack of cloth sheets comprising movable structure for penetrating the upper face of thetop sheet of the stack having a component of motion parallel to and toward the center of the 76 top of the stack and a component of motion upwardly from the stack for reducing the adhesion between the top sheet and the neighboring sheet, and means for thereafter removing the top sheet.

15. Means for separating one sheet at a time from a stack of cloth sheets comprising movable structure for penetrating the upper face of the top sheet of the stack, and means for moving said structure substantially parallel to the top of the stackand toward the center thereof to draw a portion of the top sheet along the neighboring sheet and for thereafter moving said structure upwardly from the top of the stack to release said top sheet, and means for thereafter removing the top sheet.

16. A method of separating one sheet at a time from a stack of limp sheets, which comprises lightly whipping the top surface of the top sheet of the stack toreduce the adhesion between j it and the adjacent sheet and to form a self-sustaining ripple, and thereafter removing the sheet from the stack without substantially disturbing said adjacent sheet.

17. A method of separating one sheet at a time from a stackof limp sheets, which comprises lightly whipping the top surface of the top sheet of the stack successively in different areas to produce a plurality of self-sustaining ripples, and thereafter removing the sheet from the stack without substantially disturbing the adjacent sheet.

18. A method of separating one sheet at a time 1 from a stack of limp sheets, which comprises of the stack to reduce the adhesion between it and the adjacent sheet and to form a self-sustaining ripple and thereafter grasping said ripple to remove the sheet from the stack without substantial disturbance of said adjacent sheet.

20. A method of separating one sheet at a time from a stack of limp sheets, which comprises lightly whipping the top surface of the top sheet ofthe stack successively in different areas to produce a plurality of self-sustaining ripples, and grasping one of the ripples to remove the sheet from the stack without substantial disturbance of the adjacent sheet.

21. Means for separating one sheet at a time from a stack of cloth sheets comprising rotating flexible structure for lightly whipping the top surface of the top sheet of the stack to reduce the adhesion to the adjacent sheet, and means for thereafter removing the top sheet.

22. Means for separating one sheet at a time from a stack of cloth sheets comprising a plurality of rotating flexible members for whipping the top surface of the stack to produce a plurality of self-sustaining ripples, and means. for thereafter removing the top sheet.

I 23. Means for separating one sheet at a time from a stack of cloth sheets comprising a plurality of rotating flexible members for whipping the top surface of the stack to produce a plurality of self-sustaining ripples, means for sliding the top sheet to produce a tent fold by taking up the slack produced by ripples on opposite sides thereof, and means for thereafter'grasping said fold to remove the sheet from the stack without substantial disturbance of said adjacent sheet.

24. Means for separating one sheet at a time from a stack of cloth sheets comprising rotatable structure for lightly whipping the top surface of .the top sheet of the stack to ripple it, means for thereafter removing the top sheet, and means for elevating the stack to maintain the top thereof in predetermined position with respect to said rotatable structure.

JOSEPH P. REMINGTON.